/**
 *    Copyright 2009-2018 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
/**
 * Base package for logging.
 */
/*xxx: 基础支撑层 -> 日志模块*/
/*xxx: 在java中，常用的日志框架有:  Log4j,Log4j2, Apache Commons Log,java.util.logging,slf4j等
*       这些工具对外的接口不尽相同*/
package org.apache.ibatis.logging;
